package com.lagou.controller;

import com.lagou.domain.Course;
import com.lagou.domain.CourseVo;
import com.lagou.domain.ResponseResult;
import com.lagou.service.CourseService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/course")
public class CourseController {

    @Autowired
    private CourseService courseService;

    @RequestMapping("/findCourseByCondition")
    public ResponseResult findCourseByCondition(@RequestBody CourseVo courseVo){

        //调用service
        List<Course> list = courseService.findCourseByCondition(courseVo);

        ResponseResult responseResult = new ResponseResult(true, 200, "响应成功", list);

        return responseResult;
    }

    /**
     * 课程图片上传
     */
    @RequestMapping("/courseUpload")
    public ResponseResult fileUpload(@RequestParam("file") MultipartFile file, HttpServletRequest request) throws IOException {

        //1.判断接收到的上传文件是否为空
        if (file.isEmpty()){
            throw new RuntimeException();
        }

        //2.获取项目部署路径
        //  C:\apache-tomcat-8.5.56\webapps\ssm_web\
        String realPath = request.getServletContext().getRealPath("/");
        // C:\apache-tomcat-8.5.56\webapps\
        String substring = realPath.substring(0, realPath.indexOf("ssm_web"));

        //3.获取原文件名
        //lagou.jpg
        String originalFilename = file.getOriginalFilename();

        //4.生成新文件名
        //12345621.jpg
        String newFileName = System.currentTimeMillis() + originalFilename.substring(originalFilename.lastIndexOf("."));

        //5.文件上传
        String uploadPath = substring + "upload\\";
        File filePath = new File(uploadPath, newFileName);

        //判断如果目录不存在就创建目录
        if (!filePath.getParentFile().exists()){
            filePath.getParentFile().mkdirs();
            System.out.println("创建目录：" + filePath);
        }
        //图片进行了真正的上传
        file.transferTo(filePath);

        //6.将文件名和文件路径返回，进行返回
        Map<String,String> map = new HashMap<>();
        map.put("fileName",newFileName);
        //"filePath":"http://localhost:8080/upload"/46546546.JPG
        map.put("filePath","http://localhost:8080/upload/" + newFileName);

        ResponseResult responseResult = new ResponseResult(true, 200, "图片上传成功", map);

        return responseResult;
    }

    /**
     * 新增课程信息及讲师信息
     * 新增课程信息和修改课程信息要写在同一个方法中
     */
    @RequestMapping("/saveOrUpdateCourse")
    public ResponseResult saveOrUpdateCourse(@RequestBody CourseVo courseVo) throws InvocationTargetException, IllegalAccessException {

        //如果为空是新增操作
        if (courseVo.getId() == null) {
            //调用service
            courseService.saveCourseOrTeacher(courseVo);

            ResponseResult responseResult = new ResponseResult(true, 200, "新增成功", null);

            return responseResult;
        }else {
            //不为空就是修改操作
            courseService.updateCourseOrTeacher(courseVo);

            ResponseResult responseResult = new ResponseResult(true, 200, "修改成功", null);

            return responseResult;
        }
    }

    /**
     * 回显课程信息 (根据ID查询对应的课程信息及讲师信息)
     * CourseVo:封装了对应的课程及讲师信息
     */
    @RequestMapping("/findCourseById")
    public ResponseResult findCourseById(Integer id){

        CourseVo courseVo = courseService.findCourseById(id);

        ResponseResult responseResult = new ResponseResult(true,200,"根据id查询信息成功",courseVo);

        return responseResult;
    }

    /**
     * 课程状态管理
     */
    @RequestMapping("/updateCourseStatus")
    public ResponseResult updateCourseStatus(Integer id,Integer status){

        //调用service传递参数完成课程状态的变更
        courseService.updateCourseStatus(id,status);

        //响应数据
        Map<String, Object> map = new HashMap<>();
        map.put("status",status);

        ResponseResult responseResult = new ResponseResult(true, 200, "课程状态变更成功", map);

        return responseResult;
    }
}
